CA2416529A1 - Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels - Google Patents

Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels Download PDF

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Publication number
CA2416529A1
CA2416529A1 CA002416529A CA2416529A CA2416529A1 CA 2416529 A1 CA2416529 A1 CA 2416529A1 CA 002416529 A CA002416529 A CA 002416529A CA 2416529 A CA2416529 A CA 2416529A CA 2416529 A1 CA2416529 A1 CA 2416529A1
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Prior art keywords
group
terminals
code
codes
access units
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Granted
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CA002416529A
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French (fr)
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CA2416529C (en
Inventor
James A. Proctor, Jr.
Pertti Olavi Alapuranen
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IPR Licensing Inc
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Individual
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Publication of CA2416529A1 publication Critical patent/CA2416529A1/en
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Publication of CA2416529C publication Critical patent/CA2416529C/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0022—PN, e.g. Kronecker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A technique for allowing a first and second group of users to share access t o a communication channel such as a radio channel. A first group of users is typically a legacy group of users such as those using digital CDMA cellular telephone equipment. The second group of users are a group of data users tha t code their transmissions in different formats optimized for data functionalities. The first group of users share one modulation structure suc h as, on a reverse link, using unique phase offsets of a common pseudorandom noise (PN) code. The second group of users share another modulation structur e but in a manner that is consistent and compatible with the users of the firs t group. Specifically, the users of the second group may all use the same PN code and code phase offset. However, they are uniquely identified such as, f or example, assigning each of them a unique orthogonal code.

Claims (36)

1. In a system which supports code division multiple access communication among members of a first group of terminals and among a second group of terminals, a method comprising the steps of:

assigning to the first group of terminals a first code, each user of the first group being unique identifiable by a unique code phase offset;
assigning to the second group of terminals the same code as used by the first group but each user of the second group using a common phase offset of that code; and assigning to each user of the second group an additional code, the additional code being unique for each of the terminals of the second group.
2. A method as in claim 1 wherein the code assigned to the first group of terminals is a common chipping rate code.
3. A method as in claim 1 wherein the additional codes assigned to the second group of terminals are a set of unique, orthogonal codes.
4. A method as in claim 1 wherein the code assigned to the first group of terminals is a unique, non-orthogonal scrambling sequence.
5. A method as in claim 1 wherein the first group of terminals uses scrambling codes that are unique phase shifts of a larger pseudorandom noise sequence.
6. A method as in claim 1 wherein the second group of terminals use additional codes that are a set of unique orthogonal codes.
7. A method as in claim 6 wherein the unique orthogonal code is used to scramble the transmissions of the second group of terminals at an indicated chip rate.
8. A method as in claim 7 wherein the transmission timing for the second group of terminals is synchronized to allow transmissions from the second group of terminals to be orthogonal to one another.
9. A method as in claim 1 wherein the two groups of terminals employ radio frequency modulation that is different from each other.
10. A method as in claim 1 wherein the two groups of terminals employ the codes in different spreading techniques.
11. A method as in claim 10 wherein the first group of terminals uses pairs of the codes as respective inputs to an in-phase and quadrature modulator.
12. A method as in claim 10 wherein the second group of terminals use the assigned additional codes as short scrambling codes.
13. A method as in claim 1 wherein a first group of terminals receives periodic timing adjustment information over a first link direction to provide for timing adjustment for a second link direction.
14. A method as in claim 13 wherein the second group of terminals do not receive such periodic timing adjustment information.
15. A method as in claim 1 wherein the second group of terminals use an additional code which is a short length orthogonal code.
16. A method as in claim 1 wherein the second group of terminals use an additional code which is a short length, bit augmented pseudorandom noise sequence.
17. A method as in claim 1 wherein the codes assigned to the first group of terminals and the additional codes assigned to the second group of terminals are used to encode transmissions on a reverse communication link between remotely located wireless terminals and a centrally located wireless base station.
18. A method as in claim 1 wherein the first group of terminals are legacy cellular telephone terminals.
19. A method as in claim 18 wherein the first group of terminals are assigned codes according to a CDMA cellular telephone standard specification.
20. A method as in claim 19 wherein the CDMA cellular telephone standard specification is selected from the group consisting of IS-95 and CDMA-2000.
21. A method as in claim 18 wherein the second group of terminals are used in a wireless data communication system.
22. A method as in claim 21 wherein the additional codes assigned to the second group of terminals are a set of common chip rate scrambling codes.
23. A method as in claim 22 wherein the additional codes are scrambling codes that repeat every N chips, where N is an even number in a range from 128 to 32768 chips.
24. A wireless communication system comprising a first set of access units and a second set of access units, the first set of access units and the second set of access units capable of communicating with a central base station wherein the first set of access units use a chip rate scrambling code to separate their user channels, each individual unit of the first set of access units having at least one unique, non-orthogonal scrambling sequence that is selected from a unique phase shift of a longer pseudorandom noise sequence, and wherein the second group of access units share a common chip rate scrambling code that is not used by the first group of access units.
25. The wireless communication system of claim 24 wherein each unit of the second set is assigned at least one unique orthogonal code.
26. The wireless communication system of claim 24 wherein the chip rate transmissions of the second set of access units are scrambled by the bits of the orthogonal code at a chipping rate.
27. The wireless communication system of claim 24 wherein the transmission timing of the second set of access units is controlled such that their transmissions are orthogonal to each other.
28. The wireless communication system of claim 24 wherein the scrambling code is 2 42 chips in length.
29. The wireless communication system of claim 24 wherein the first set of access units and the second set of access units employ different modulation techniques.
30. The wireless communication system of claim 24 wherein the first set of access units and the second set of access units employ different spreading techniques.
31. The wireless communication system of claim 30 wherein the first set of access units employ complex in-phase and quadrature spreading.
32. The wireless communication system of claim 31 wherein the complex in-phase and quadrature spreading uses two different scrambling codes.
33. The wireless communication system of claim 32 wherein the two different scrambling codes are 2 15 in length.
34. The wireless communication system of claim 32 wherein the two different scrambling codes comprise an in-phase (I) code and a quadrature (Q) code.
35. The wireless communication system of claim 31 wherein the second set of access units use a scrambling code that is 2 15 in length.
36. The wireless communication system of claim 24 wherein the access units are using the assigned codes to format signals for a reverse link communication signal.
CA2416529A 2000-07-19 2001-07-06 Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels Expired - Fee Related CA2416529C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US21978900P 2000-07-19 2000-07-19
US60/219,789 2000-07-19
US09/898,514 US7006428B2 (en) 2000-07-19 2001-07-03 Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels
US09/898,514 2001-07-03
PCT/US2001/021452 WO2002009320A2 (en) 2000-07-19 2001-07-06 Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels

Publications (2)

Publication Number Publication Date
CA2416529A1 true CA2416529A1 (en) 2002-01-31
CA2416529C CA2416529C (en) 2012-11-06

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CA2416529A Expired - Fee Related CA2416529C (en) 2000-07-19 2001-07-06 Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels

Country Status (13)

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US (2) US7006428B2 (en)
EP (2) EP1319277B1 (en)
JP (1) JP2004508745A (en)
KR (5) KR20090005246A (en)
CN (2) CN1747360B (en)
AU (3) AU2001271886B2 (en)
BR (1) BR0113008A (en)
CA (1) CA2416529C (en)
HK (3) HK1053913A1 (en)
MX (1) MXPA03000465A (en)
NO (1) NO328557B1 (en)
NZ (1) NZ524233A (en)
WO (1) WO2002009320A2 (en)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7911993B2 (en) * 2000-07-19 2011-03-22 Ipr Licensing, Inc. Method and apparatus for allowing soft handoff of a CDMA reverse link utilizing an orthogonal channel structure
US8537656B2 (en) * 2000-07-19 2013-09-17 Ipr Licensing, Inc. Method for compensating for multi-path of a CDMA reverse link utilizing an orthogonal channel structure
US7006428B2 (en) * 2000-07-19 2006-02-28 Ipr Licensing, Inc. Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels
US7154846B2 (en) * 2000-10-24 2006-12-26 Nortel Networks Limited Shared channel structure, ARQ systems and methods
AUPR206300A0 (en) * 2000-12-13 2001-01-11 Advanced Communications Technologies (Australia) Pty Ltd A method for quadrature spreading
US7085313B2 (en) * 2001-02-17 2006-08-01 Koninklijke Philips Electronics N.V. Multiple channel joint decoding at mobile handset
US6917581B2 (en) 2001-07-17 2005-07-12 Ipr Licensing, Inc. Use of orthogonal or near orthogonal codes in reverse link
GB2381711B (en) * 2001-10-31 2003-10-15 Lucent Technologies Inc A method of allocating a channelisation code to one of a plurality of user terminals, a code division multiple access telecommunications network,
US7321576B2 (en) 2001-11-15 2008-01-22 Nokia Corporation Method for compact representation of multi-code signaling in communication systems
US20030202563A1 (en) * 2002-04-26 2003-10-30 Arnab Das Rate adaptation and antenna selection in a wireless communication system
TWI364920B (en) * 2002-11-20 2012-05-21 Ipr Licensing Inc Soft handoff of a cdma reverse link
DE10359268B4 (en) * 2003-12-17 2011-05-19 Infineon Technologies Ag Device for generating transmission signals in a mobile radio station by means of a scrambling code generator for preambles and for transmission signals of dedicated physical channels
US7907574B2 (en) * 2004-01-29 2011-03-15 Qualcomm Incorporated Channel scheduling
US20050249311A1 (en) * 2004-05-07 2005-11-10 Nollett Bryan S Modulation schemes for reduced power amplifier backoff
US8259688B2 (en) 2006-09-01 2012-09-04 Wi-Lan Inc. Pre-allocated random access identifiers
GB2454198A (en) * 2007-10-31 2009-05-06 Nokia Siemens Networks Oy A communication system comprising a communication terminal using a non-orthogonal or hybrid orthogonal/non-orthogonal uplink waveform.
US9648493B2 (en) 2007-11-16 2017-05-09 Qualcomm Incorporated Using identifiers to establish communication
US7773664B2 (en) * 2008-03-18 2010-08-10 On-Ramp Wireless, Inc. Random phase multiple access system with meshing
US8520721B2 (en) 2008-03-18 2013-08-27 On-Ramp Wireless, Inc. RSSI measurement mechanism in the presence of pulsed jammers
US8958460B2 (en) 2008-03-18 2015-02-17 On-Ramp Wireless, Inc. Forward error correction media access control system
US7782926B2 (en) * 2008-03-18 2010-08-24 On-Ramp Wireless, Inc. Random phase multiple access communication interface system and method
EP2266210A4 (en) * 2008-03-18 2011-07-27 On Ramp Wireless Inc Random phase multiple access system with meshing
US8477830B2 (en) 2008-03-18 2013-07-02 On-Ramp Wireless, Inc. Light monitoring system using a random phase multiple access system
US9094880B2 (en) 2008-06-19 2015-07-28 Qualcomm Incorporated Access terminal assisted node identifier confusion resolution using a time gap
US8743858B2 (en) * 2008-07-15 2014-06-03 Qualcomm Incorporated Wireless communication systems with femto cells
US8989138B2 (en) 2008-07-15 2015-03-24 Qualcomm Incorporated Wireless communication systems with femto nodes
US8363699B2 (en) 2009-03-20 2013-01-29 On-Ramp Wireless, Inc. Random timing offset determination
JP5023178B2 (en) * 2010-03-29 2012-09-12 株式会社東芝 Mobile radio terminal apparatus and mobile communication system
CN104506473B (en) * 2014-12-08 2018-06-22 青岛农业大学 A kind of method for transmitting signals of LTE system based on automatic adjusument reference vector
CN104506275B (en) * 2014-12-08 2018-06-22 青岛农业大学 A kind of LTE signal transmission systems based on automatic adjusument reference vector
US11101910B2 (en) * 2018-01-12 2021-08-24 Qualcomm Incorporated Sequence based short code design for resource spread multiple access (RSMA)

Family Cites Families (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460992A (en) * 1982-11-04 1984-07-17 The United States Of America As Represented By The Secretary Of The Army Orthogonal CDMA system utilizing direct sequence pseudo noise codes
US5101501A (en) * 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
US5103495A (en) * 1991-04-11 1992-04-07 The United States Of America As Represented By The Secretary Of The Air Force Partitioned optical delay line architecture for time steering of large 1-D array antennas
US5870427A (en) * 1993-04-14 1999-02-09 Qualcomm Incorporated Method for multi-mode handoff using preliminary time alignment of a mobile station operating in analog mode
US5404376A (en) * 1993-09-09 1995-04-04 Ericsson-Ge Mobile Communications Inc. Navigation assistance for call handling in mobile telephone systems
US5414728A (en) * 1993-11-01 1995-05-09 Qualcomm Incorporated Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communication channels
JP2677191B2 (en) * 1994-03-15 1997-11-17 日本電気株式会社 CDMA communication system
US6035197A (en) * 1994-12-29 2000-03-07 Cellco Partnership Method and system for providing a handoff from a CDMA cellular telephone system
FI103081B1 (en) * 1996-02-23 1999-04-15 Nokia Telecommunications Oy Handover in a mobile communication system
JP3392630B2 (en) * 1996-03-22 2003-03-31 松下電器産業株式会社 Spread spectrum communication equipment
JPH09321665A (en) * 1996-05-24 1997-12-12 Matsushita Electric Ind Co Ltd Transmitter-receiver
US6396804B2 (en) * 1996-05-28 2002-05-28 Qualcomm Incorporated High data rate CDMA wireless communication system
JPH1013918A (en) * 1996-06-19 1998-01-16 Toshiba Corp Moving communication system, adapting code division multiple access system, and its radio communication device
JPH1022874A (en) * 1996-07-09 1998-01-23 Hitachi Ltd Cdma communication system and method therefor
US5937019A (en) * 1996-08-07 1999-08-10 Qualcomm Incorporated Method and apparatus for reliable intersystem handoff in a CDMA system
JP3373746B2 (en) * 1997-01-07 2003-02-04 株式会社鷹山 Initial synchronization method and receiver in asynchronous cellular system between DS-CDMA base stations
US6898197B1 (en) * 1997-02-28 2005-05-24 Interdigital Technology Corporation Geolocation of a mobile terminal in a CDMA communication system
KR100219035B1 (en) * 1997-03-13 1999-09-01 이계철 Apparatus and method for spreading spectrum in order to wireless multimedia service with variable rate
US5867525A (en) * 1997-06-10 1999-02-02 L-3 Commuications Corporation Synchronizer and method therefor and communications system incorporating same
US6590889B1 (en) * 1997-08-11 2003-07-08 Gte Internetworking Incorporated Data communications system and hybrid time-code multiplexing method
DE19741872C1 (en) * 1997-09-23 1999-02-04 Deutsche Telekom Ag Adaptive receiver for CDMA base station
US6574211B2 (en) * 1997-11-03 2003-06-03 Qualcomm Incorporated Method and apparatus for high rate packet data transmission
US6044074A (en) * 1997-11-10 2000-03-28 Qualcomm Incorporated Rapid signal acquisition and synchronization for access transmissions
KR100407355B1 (en) * 1998-02-14 2004-04-03 삼성전자주식회사 Apparatus and method for aligning time of reverse link in mobile communication system
US6563808B1 (en) * 1998-03-04 2003-05-13 Stanford Telecommunications, Inc. Apparatus for incorporating multiple data rates in an orthogonal direct sequence code division multiple access (ODS-CDMA) communications system
US6091760A (en) * 1998-06-29 2000-07-18 L-3 Communications Corporation Non-recursively generated orthogonal PN codes for variable rate CDMA
US6144651A (en) * 1998-07-17 2000-11-07 Motorola, Inc. Data transmission within a wireless communication system
KR100442661B1 (en) * 1998-11-02 2004-10-14 삼성전자주식회사 Device and method for generating code in mobile communication system
US6512925B1 (en) * 1998-12-03 2003-01-28 Qualcomm, Incorporated Method and apparatus for controlling transmission power while in soft handoff
US7133352B1 (en) * 1999-09-20 2006-11-07 Zion Hadad Bi-directional communication channel
CA2371958C (en) * 1999-04-12 2006-07-25 Samsung Electronics Co., Ltd. Apparatus and method for gated transmission in a cdma communication system
EP1049349B1 (en) * 1999-04-30 2002-02-27 Alcatel Alsthom Compagnie Generale D'electricite CDMA soft handover method using uplink measurements
US6377814B1 (en) * 2000-02-07 2002-04-23 Qualcomm Incorporated Method and apparatus for supervising transmit power in a high data rate system
US7116646B1 (en) * 2000-03-07 2006-10-03 Telefonakitebolaget Lm Ericsson (Publ) CDMA internet protocol mobile telecommunications network architecture and methodology
US6463074B1 (en) * 2000-06-14 2002-10-08 Tantivy Communications, Inc. Receiver for time division multiplex system without explicit time slot assignment
US8537656B2 (en) * 2000-07-19 2013-09-17 Ipr Licensing, Inc. Method for compensating for multi-path of a CDMA reverse link utilizing an orthogonal channel structure
US7911993B2 (en) * 2000-07-19 2011-03-22 Ipr Licensing, Inc. Method and apparatus for allowing soft handoff of a CDMA reverse link utilizing an orthogonal channel structure
US7006428B2 (en) * 2000-07-19 2006-02-28 Ipr Licensing, Inc. Method for allowing multi-user orthogonal and non-orthogonal interoperability of code channels
US7054292B2 (en) * 2000-10-27 2006-05-30 L-3 Communications Corporation Hybrid synchronous space/code multiple access system using an adaptive antenna system
US6416797B1 (en) * 2001-02-14 2002-07-09 Kraft Foods Holdings, Inc. Process for making a wheyless cream cheese using transglutaminase
CN1150709C (en) * 2001-02-28 2004-05-19 信息产业部电信传输研究所 Speed band-enlarging and-deenlarging method for two-stage code converter chips in CDMA cellular system
US6917581B2 (en) * 2001-07-17 2005-07-12 Ipr Licensing, Inc. Use of orthogonal or near orthogonal codes in reverse link
US7020110B2 (en) * 2002-01-08 2006-03-28 Qualcomm Incorporated Resource allocation for MIMO-OFDM communication systems

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Publication number Publication date
JP2004508745A (en) 2004-03-18
CA2416529C (en) 2012-11-06
US7006428B2 (en) 2006-02-28
BR0113008A (en) 2004-07-06
US20060140157A1 (en) 2006-06-29
CN1448010A (en) 2003-10-08
HK1089304A1 (en) 2006-11-24
NO20030253D0 (en) 2003-01-17
CN1747360B (en) 2010-08-11
US20020009068A1 (en) 2002-01-24
KR20100022101A (en) 2010-02-26
NZ524233A (en) 2004-09-24
AU2007200239B2 (en) 2010-03-04
KR20070051954A (en) 2007-05-18
CN1747360A (en) 2006-03-15
AU2001271886B2 (en) 2006-10-19
EP1319277B1 (en) 2014-08-27
WO2002009320A3 (en) 2003-03-27
NO328557B1 (en) 2010-03-22
NO20030253L (en) 2003-03-18
HK1053913A1 (en) 2003-11-07
KR20070104952A (en) 2007-10-29
KR100895034B1 (en) 2009-05-04
EP1319277A2 (en) 2003-06-18
CN1231004C (en) 2005-12-07
HK1205830A1 (en) 2015-12-24
KR20030031124A (en) 2003-04-18
EP2827512A1 (en) 2015-01-21
AU2007200239A1 (en) 2007-02-08
KR20090005246A (en) 2009-01-12
AU7188601A (en) 2002-02-05
MXPA03000465A (en) 2004-01-26
WO2002009320A2 (en) 2002-01-31

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